31288422 has 48 divisors (see below), whose sum is σ = 69866496. Its totient is φ = 9332400.

The previous prime is 31288409. The next prime is 31288423. The reversal of 31288422 is 22488213.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 31288422.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31288423) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 51243 + ... + 51849.

It is an arithmetic number, because the mean of its divisors is an integer number (1455552).

Almost surely, 2^31288422 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31288422, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34933248).

31288422 is an abundant number, since it is smaller than the sum of its proper divisors (38578074).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31288422 is a wasteful number, since it uses less digits than its factorization.

31288422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 705 (or 694 counting only the distinct ones).

The product of its digits is 6144, while the sum is 30.

The square root of 31288422 is about 5593.6054562330. The cubic root of 31288422 is about 315.1092994352.

The spelling of 31288422 in words is "thirty-one million, two hundred eighty-eight thousand, four hundred twenty-two".